Holley 4500 Dominator 1050 CFM - Chevelle Tech
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  #1  
Old Jul 12th, 10, 3:24 PM
larry87 larry87 is offline
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Default Holley 4500 Dominator 1050 CFM

I have this carb installed on my 496 BB and at Idle all I can smell is fuel (running rich) so I was tuning the air/fuel mixture screws and it never cleared up. So whats next, Jetting? Does anyone know what size the jets are that came in the Carb. I am running a Pro billet distributor from MSD along with their 6AL ignition box and blaster coil so I know I am getting enough spark. Please help me this is driving me crazy.
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  #2  
Old Jul 12th, 10, 3:28 PM
Mike Mike is offline
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Default Re: Holley 4500 Dominator 1050 CFM

Main jet's have nothing to do with idle unless your RPM's are so high that your out of the idle circuit.
Try a search as this has been discussed numerous times.
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  #3  
Old Jul 12th, 10, 9:01 PM
DragRacer DragRacer is offline
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Default Re: Holley 4500 Dominator 1050 CFM

Larry,

It depends on which version of the carb you have. HP version? 2 or 3 circuit?

To fix a rich idle you are going to have to restrict (REDUCE) the idle feed restrictor (fuel) in the metering block or INCREASE the air bleed in the main body or both.

If you aren't running a primary power valve, I would highly recommend it if you intend to cruise with the carb.
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  #4  
Old Jul 12th, 10, 10:32 PM
Ron Gusack Ron Gusack is offline
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Default Re: Holley 4500 Dominator 1050 CFM

Could easily be a bad power valve, if it has one in it.
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  #5  
Old Jul 13th, 10, 2:19 AM
BillyGman BillyGman is online now
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Default Re: Holley 4500 Dominator 1050 CFM

Quote:
Originally Posted by DragRacer View Post
Larry,

It depends on which version of the carb you have. HP version? 2 or 3 circuit?

To fix a rich idle you are going to have to restrict (REDUCE) the idle feed restrictor (fuel) in the metering block or INCREASE the air bleed in the main body or both.

If you aren't running a primary power valve, I would highly recommend it if you intend to cruise with the carb.
I think that Jason is on the right track here^... but in case you don't already know this, Dominators are known for being some of the worst carbs for street cruising, or for any part throttle operation for that matter. They're intended mostly for full throttle operation, and above 3,000 RPM, and that's where they shine.

Some aftermarket companies have come out with their own versions of Dominator carbs which have the circuits extensively re-worked in order to tame the typical Dominator trade mark of being overly rich during any part throttle inputs. AED is one of those companies, offering their "Pro Street" Dominator carb. Good luck with yours.
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  #6  
Old Jul 13th, 10, 2:33 AM
Tod74 Tod74 is offline
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Default Re: Holley 4500 Dominator 1050 CFM

If it is an older 8896 it was jetted 88 square when new.( mine was anyway)

I say older meaning before the HP version, which is 8896-1. Don't know what they have.

Dominators are not intended for a street car. They are for racing so I think getting it to idle clean will take some "know how."
]
Anyhow, I don't know if it is true for a dominator but on a 4150 if the idle mixture screws do nothing when you turn them, that usually means you have the throtle speed screw adjusted in far enough to uncover the transfer slot in the base plate,which causes you to pull fuel from the main circuit rather than the idle circuit.
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  #7  
Old Jul 13th, 10, 7:37 AM
DragRacer DragRacer is offline
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Default Re: Holley 4500 Dominator 1050 CFM

Billy and Todd,

A well tuned dominator can work just fine on the street. Good starting, good idle, good off idle, and obviously at WOT.

They don't just get there by themselves though out of the box
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  #8  
Old Jul 13th, 10, 2:13 PM
larry87 larry87 is offline
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Default Re: Holley 4500 Dominator 1050 CFM

Thanks Guys. My car is not intended for a avid crusier just something to play with on the street and strip with some mild and very short in-town trips.
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  #9  
Old Jul 13th, 10, 2:14 PM
larry87 larry87 is offline
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Default Re: Holley 4500 Dominator 1050 CFM

Quote:
Originally Posted by DragRacer View Post
Billy and Todd,

A well tuned dominator can work just fine on the street. Good starting, good idle, good off idle, and obviously at WOT.

They don't just get there by themselves though out of the box
Can you point me in the right direction to getting my carb a little more streetability?

Well at least not smelling like Fuel at idle?
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  #10  
Old Jul 13th, 10, 7:44 PM
Tod74 Tod74 is offline
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Default Re: Holley 4500 Dominator 1050 CFM

Quote:
Originally Posted by DragRacer View Post
Billy and Todd,

A well tuned dominator can work just fine on the street. Good starting, good idle, good off idle, and obviously at WOT.

They don't just get there by themselves though out of the box
That's why I said it will take some "know how"
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  #11  
Old Jul 13th, 10, 9:07 PM
DragRacer DragRacer is offline
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Default Re: Holley 4500 Dominator 1050 CFM

Quote:
Originally Posted by larry87 View Post
Can you point me in the right direction to getting my carb a little more streetability?

Well at least not smelling like Fuel at idle?
Larry,

Let's start at the basics:

1.) What RPM do you need your car/engine to idle and idle in gear?
2.) What is your fuel pressure at idle? IMO - Don't exceed 7 psi.
3.) Set front float level so that fuel just dribbles out of the sight plug at idle. The rear can be a little higher, but don't get carried away.
4.) Set both the front and rear throttle blades to no more than ~.040" of transition slot exposed. That is your max setting. You can close them from this setting, but don't open further to achieve more idle speed.
5.) Typical jetting is 88/88 with no power valve. Put 80/88 with a power valve in the front. Start with a PV with a vacuum reading a couple of in-Hg below your idle vacuum.
6.) Adjust the 4-corner idle screws for the highest idle RPM in gear. If you don't have a helper, set it to the highest vacuum or highest RPM at idle.
7.) Back to #4, Do NOT open the throttle blades anymore if idle is still too low. Only close if too high. If idle RPM is still too low, you are going to have to bypass some more air at idle. There are a couple of ways to do this on a Dominator.

Let us know what you get when you get to that point and we can go from there.
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  #12  
Old Jul 14th, 10, 1:04 AM
matattack68 matattack68 is offline
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Default Re: Holley 4500 Dominator 1050 CFM

Quote:
Originally Posted by DragRacer View Post
Billy and Todd,

A well tuned dominator can work just fine on the street. Good starting, good idle, good off idle, and obviously at WOT.

They don't just get there by themselves though out of the box
X2... Dominators can run just fine on the street. They just take a little time to get right. I've got 2 1050's on my blown 496, and the ran is ran on the street all the time. Never had any issues with idling, or starting, just took a little while to get right.
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  #13  
Old Jul 14th, 10, 11:26 AM
larry87 larry87 is offline
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Default Re: Holley 4500 Dominator 1050 CFM

Quote:
Originally Posted by DragRacer View Post
Larry,

Let's start at the basics:

1.) What RPM do you need your car/engine to idle and idle in gear?
2.) What is your fuel pressure at idle? IMO - Don't exceed 7 psi.
3.) Set front float level so that fuel just dribbles out of the sight plug at idle. The rear can be a little higher, but don't get carried away.
4.) Set both the front and rear throttle blades to no more than ~.040" of transition slot exposed. That is your max setting. You can close them from this setting, but don't open further to achieve more idle speed.
5.) Typical jetting is 88/88 with no power valve. Put 80/88 with a power valve in the front. Start with a PV with a vacuum reading a couple of in-Hg below your idle vacuum.
6.) Adjust the 4-corner idle screws for the highest idle RPM in gear. If you don't have a helper, set it to the highest vacuum or highest RPM at idle.
7.) Back to #4, Do NOT open the throttle blades anymore if idle is still too low. Only close if too high. If idle RPM is still too low, you are going to have to bypass some more air at idle. There are a couple of ways to do this on a Dominator.

Let us know what you get when you get to that point and we can go from there.
I am running the 8896-1 Dominator. So with that here is the answers to the following questions.

1. I would say 700 to 1200 rpm at idle and I am running a manual transmission.
2. Fuel pressure is at 6 - 7psi

I checked the fuel floats but I double check them later on this week. I'll start from there. I do not have any vacuum ports so I have been thinking about tapping my carb spacer for one Since I do have a vacuum gauge installed in the car.
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  #14  
Old Jul 14th, 10, 12:03 PM
Aftermart Aftermart is offline
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Default Re: Holley 4500 Dominator 1050 CFM

How much cam shaft,what heads,how much compression?This 4500 may be just to BIG of a carb for your combination.If you can get your hands on a good 850,give it a try.Mark.
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  #15  
Old Jul 14th, 10, 12:57 PM
BillyGman BillyGman is online now
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Default Re: Holley 4500 Dominator 1050 CFM

Quote:
Originally Posted by Aftermart View Post
How much cam shaft,what heads,how much compression?This 4500 may be just to BIG of a carb for your combination.If you can get your hands on a good 850,give it a try.Mark.
This^ is a very good point. How high are you reving this 496 engine? And what cam and combustion chamber size is in it? I have a 1050 CFM Dominator carb on my 632 CID engine with a camshaft that has a 268/271 duration @.050 and a power peak of 5,900 RPM. If you're not winding this 496 engine past 7,000 RPM, then you might not need such a big carb. In that case, even if you jet it down, the venturi cross sections might be too big, and might provide a weak signal due to lack of adequate air velocity.
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